I think anything they were doing habitually that was taking away from their time at work would have gotten them fired.  Whether that is gambling, porn, video games, stocks, crypto trading, memes, nfts, etc.  I doubt his boss cared much what he was doing, only that he wasn't doing his work.  That makes you wonder if he were a high performing employee, what sort of nonsense would his employer put up with as far as gambling before letting him go.